What is the best way to get an overdrive auto in a 67 Barracuda?

Carnut76 said

The 4L80E can be converted to manual shift with a trans brake etc. with a valve body that Extreme offers for about a thousand bucks otherwise you can buy a stand alone setup for about 500. I probably can get a 200R4 that will hold up Extreme has one they advertise to hold 700 hp for 2300.00 but add the cross-member, bell housing, adapter, converter, then compare to the cost of the GV behind my 727, the economics part of me is asking if the extra 200-300 rpm difference you get from a .78 OD vs a .67 is worth the extra 2k bucks?

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There are a few other advantages aside from the larger rpm drop in OD. The 1st gear ratio is 2.76 to 1 vs 2.5 to 1. The converter can be built to utilize a lock-up clutch system, which will drop you rpm another 250-300 rpm.

Also, I had my converter made to bolt right up to my factor flexplate without the use of any adapters. I see some of you spent several hundred dollars more on adapting the 3-bolt GM converter to your cranks. The cost was the same for my converter. I did have to provide the measurements. I opted for a top-shelf 3600 rpm stall converter with a 3 carbon fiber lock-up clutch system. The thing is friggen awesome to drive on the street and at the track with the 200R4.